I use USPS for most of my shipping too, occaisonally UPS depending on the destination. Regular UPS Ground service delivers the following day to a good-size area, while Priority Mail would take 2-3 days simply because the shipment is routed differently. I'd estimate around 95-96% of my shipments, both coming and going, have been fine. There have been a few incidents of lost or damaged packages, but no shipping service is perfect.